OMM TGZ-1 TGZ 040A through TGZ 190A 29
Continued next page.
Table 15, Setpoints, Continued
Description Default Range PW
Stage Up Time 2 min 1 to 60 min M
Stage Down Time 5 min 1 to 60 min M
Stage Differential 3.0 °F 1.0 to 10.0 °F M
Stage #1 On 70 °F 40 to 120 °F M
Stage #2 On 75 °F 40 to 120 °F M
Valve/VFD Control None
None, Valve Set point, Valve Stage,
VFD Stage, Valve SP/VFD Stage
M
Valve Setpoint 65 °F 60 to 120 °F M
Valve Deadband 2.0 °F 1.0 to 10.0 °F M
Stage Fan Down @ 20% 0 to 100% M
Stage Fan Up @ 80% 0 to 100% M
Valve Control Range (Min) 10% 0 to 100% M
Valve Control Range(Max) 90% 0 to 100% M
Valve Type NC to tower NC, NO M
Minimum Start Position 0% 0 to 100% M
Minimum Position @ 60 °F 0 to 100 °F M
Maximum Start Position 100% 0 to 100% M
Maximum Position @ 90 °F 0 to 100 °F M
Error Gain 25 10 to 99 M
Slope Gain 25 10 to 99 M
*Set at McQuay factory.
Table 16, Automatic Adjusted Limits
The following are set points that will be limited based on the option selected.
For Evaporator Leaving Water Temperature
Mode Refrigerant Type Range
Unit Mode = Cool R134a, R22, R407c, R410a
40 to 60°F
Unit Mode = Cool w/Glycol R134a, R22, R407c
20 to 60°F
For Condenser Leaving Water Temperature
Mode Refrigerant Type Range
Unit Mode=HEAT R134a 110 to 160ºF
Evaporator Freeze Temperature
Mode Refrigerant Type Range
Unit Mode = Cool
R134a,R22, R407c, R410a
36 to 42°F
Unit Mode = Cool w/Glycol,
Ice w/Glycol
R134a,R22, R407c
18 to 42°F
Low Evaporator Pressure Inhibit Loading and Unloading
Mode Refrigerant Type Range
Unit Mode = Cool R134a 26 to 54 psi
Unit Mode = Cool w/Glycol, Ice
w/Glycol
R134a 12 to 54 psi
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